Principles of Geotechnical Engineering (MindTap Course List)
9th Edition
ISBN: 9781305970939
Author: Braja M. Das, Khaled Sobhan
Publisher: Cengage Learning
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Chapter 16, Problem 16.10P
If the water table in Problem 16.9 drops down to 0.25 m below the foundation level, what would be the change in the factor of safety for the same gross allowable load?
16.9 A square footing is shown in Figure 16.18. Determine the gross allowable load, Qall, that the footing can carry. Use Terzaghi’s equation for general shear failure (Fs = 4). Given: γ = 17 kN/m3, γsat = 19.2 kN/m3, c′ = 32 kN/m3,
Figure 16.18
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A gravity retaining wall is shown in the figure below. Calculate the factor of safety with respect to overturning and sliding, given the following data:
Wall dimensions: H = 6 m, x1 = 0.6 m, x2 = 2 m, x3 = 2m,
x4 0.5 m, x5 = 0.75 m, x6 = 0.8 m, D= 1.5 m
Soil properties: 71 = 15.5 kN/m³, ₁ = 32°, Y2 = 18 kN/m³,
2=22°, c₂ = 40 kN/m²
H
x6
X2 TXT
X3
Use Coulomb's active earth pressure in your calculation and let ' = 2/3 01. Use Yconcrete = 23.58 kN/m³. Also, use k₁ = k₂ = 2/3 and P = 0 in equation
FS (sliding)
(ΣV) tan(k₁₂2) + Bk2c + Pp
Pa cos a
For 1 = 32°, a = 0°, B = 71.57°, Ka = 0.45, 8' = 21.33°.
(Enter your answers to three significant figures.)
FS (overturning)
FS (sliding)
=
For the cantilever retaining wall shown in the figure below, let the following data be given:
Wall dimensions: H = 6.5 m, x1 = 0.3 m, x2 = 0.6 m, x3 = 0.8 m,
x4 2 m, x5 = 0.8 m, D= 1.5 m, a = 0°
Soil properties: 71 = 17.08 kN/m³, ₁ = 36°, Y2 = 19.65 kN/m³,
2 = 15°, c₂ = 30 kN/m²
For 2=15°: N = 10.98; N₁ = 3.94; N₁ = 2.65.
x2
..
c₁ = 0
Φί
H
x5
Calculate the factor of safety with respect to overturning, sliding, and bearing capacity. Use Yconcrete = 24.58 kN/m³. Also, use k₁ = k2 = 2/3 and P₂ = 0 in equation
(EV) tan(k102) + Bk2c₂ + Pp
FS (sliding)
Pa cos a
(Enter your answers to three significant figures.)
FS (overturning)
FS (sliding)
FS (bearing)
=
=
=
A) # of Disinfection Clearwells: 3
B) Clearwell Operation Style: Parallel (to provide contact time for disinfection
using free chlorine (derived from a hypochlorite solution generated onsite).
C) The facility's existing system to generate hypochlorite onsite has reached
the end of its useful life, and the current operating capacity is insufficient
to generate the required mass flow of hypochlorite to accommodate the
future capacity of 34.5 MGD. Assume the facility plans to stop generating
hypochlorite onsite and will instead purchase a bulk solution of sodium
hypochlorite
D) Sodium hypochlorite (NaOCI) concentration: 6.25% NaOCI by mass
E) Bulk Density: 1,100 kg/m^3
F) Clearwell T10/DT Ratio: (CW1 0.43). (CW2 = 0.51), (CW3 = 0.58)
DT is the theoretical mean hydraulic retention time (V/Q)
G) pH: 7.0
H) Design Temperature: 15°C
1) 50% of Chlorine is lost in each clearwell
J) If the concentration going into the clearwell is C, then you can assume that
the concentration leaving the…
Chapter 16 Solutions
Principles of Geotechnical Engineering (MindTap Course List)
Ch. 16 - A continuous footing is shown in Figure 16.17....Ch. 16 - Refer to Problem 16.1. If a square footing with...Ch. 16 - Redo Problem 16.1 with the following: = 115...Ch. 16 - Redo Problem 16.1 with the following: = 16.5...Ch. 16 - Redo Problem 16.1 using the modified general...Ch. 16 - Redo Problem 16.2 using the modified general...Ch. 16 - Redo Problem 16.3 using the modified general...Ch. 16 - Redo Problem 16.4 using the modified general...Ch. 16 - Prob. 16.9PCh. 16 - If the water table in Problem 16.9 drops down to...
Ch. 16 - Prob. 16.11PCh. 16 - A square footing is subjected to an inclined load...Ch. 16 - A square footing (B B) must carry a gross...Ch. 16 - Redo Problem 16.13 with the following data: gross...Ch. 16 - Refer to Problem 16.13. Design the size of the...Ch. 16 - Prob. 16.16PCh. 16 - Prob. 16.17PCh. 16 - Refer to the footing in Problem 16.16. Determine...Ch. 16 - Figure 16.21 shows a continuous foundation with a...Ch. 16 - The following table shows the boring log at a site...
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